Replace computeNode() with AstProvider in search.

pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.refactoring;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart'
     show
@@ skipping 169 matching lines @@
     }
   }
 
   void setUp() {
     super.setUp();
     if (enableNewAnalysisDriver) {
       searchEngine = new SearchEngineImpl2([driver]);
       astProvider = new AstProviderForDriver(driver);
     } else {
       index = createMemoryIndex();
-      searchEngine = new SearchEngineImpl(index);
+      searchEngine = new SearchEngineImpl(
+          index, (_) => new AstProviderForContext(context));
       astProvider = new AstProviderForContext(context);
     }
   }
 }